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Verified answer
L.Lingkaran = π × r²= 3.14 × 37.5²
= 3.14 × 140.625
= 441.5625 cm²
NB : π = 22/7 atau 3.14
jari-jari = diameter ÷ 2
Jika Keliling Lingkaran = π × d
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Rumus luas lingkaran=π×r×r
R=75:2=37,5
Luas=π×r×r
=3,14×37,5×37,5
=4.415,625
Ket:
D=Diameter
R=Jari-jari
π=22/7 atau 3,14